"Covered with Egyptian Darkness": New England's Dark Day of 1780

While the weather in Massachusetts was sunny and beautiful over Mothers' Day weekend, many other places in the country experienced extreme and severe weather ranging from hail and tornadoes to flooding and blizzards. On 19 May 1780, Massachusetts, along with the rest of New England, experienced a different type of extreme weather event in what became known as the "dark day."

Abigail Adams, home in Braintree while John continued his diplomatic mission in Europe, recorded her impressions of "a strange Phenomena":

"On fryday the 19 of May the Sun rose with a thick smoaky atmosphere indicating dry weather which we had for ten days before. Soon after 8 oclock in morning the sun shut in and it rained half an hour, after that there arose Light Luminous clouds from the north west, the wind at south west. They gradually spread over the hemisphere till such a darkness took place as appears in a total Eclipse. By Eleven oclock candles were light up in every House, the cattle retired to the Barns, the fouls to roost and the frogs croaked. The greatest darkness was about one oclock. It was 3 before the Sky assumed its usual look. . . . About 8 oclock in the Evening almost Instantainously the Heavens were covered with Egyptian Darkness, objects the nearest to you could not be discerned tho the Moon was at her full. . . . I hope some of our Philosophical Geniousess will endeavour to investigate so unusual an appearence. It is matter of great consternation to many. It was the most solemn appearence my Eyes ever beheld but the Philosophical Eye can look through and trust the Ruler of the Sky."

"This uncommon Darkness, greater in Degree and longer in Duration than had ever been before amongst us occasioned much Speculation, some attributed it to the Influence of the Planets, some to the Effects of a Comet and some to an Eruption of a Vulcano. The Vulgar considered it some as portending great Calamities, others as a Prelude to the general Dissolution of all Things. A close Attention to what appeared before and during this Event will help us to (at least) a probable Solution of this Matter, without having Recourse to the Planets &c. for a Cause. Prior to this, The Woods from Ticonderoga for Thirty Miles downwards had been for some Time on Fire. No Rain for many Days, Winds chiefly at West and N. West. By these the Smoak and Vapours were carried to a great Distance, insomuch that in our Vicinity, the Sky was at Times obscurd, the Air crowded with Smoak and Vapours, a disagreable Smell like what proceeds from Swamps on Fire."

Indeed, Tufts' explanation of forest fires proved correct; however, it was only recently that examination of tree rings in the forests of Ontario, Canada, indeed confirmed a widespread fire sending smoke far into New England, coupled with fog and cloud cover combined to produce a weather event that was remembered for generations.